Protecting means for flask rest actuating mechanism



ATTORNEY 6'- F JCHERERINVENTOR.

Aug. 30, 1932. c. F. SCHERER PROTECTING MEANS FOR FLASK REST ACTUA'IING MECHANISM Filed April 26. 1950 Patented Aug. 30, 1932 UNITED STATES PATENT OFFICE.

CHARLES F. SCHERER, OF DAVENPORT, IOWA, ASSIGNOR T0 DAVENPORT MACHINE AND FOUNDRY COMPANY, OF DAVENPORT, IOWA, A CORPORATION OF IOWA PROTECTING MEANS FOR FLASK REST ACTUATING MECHANISM Application filed April 26,

The present invention pertains to foundry equipment and more particularly to certain means for protecting the draw cylinder and piston against access of sand thereto whereby the working parts might become scored that they would thereafter 'be lacking in normal efiiciency.

Among the objects of this invention are, to provide a substantial protecting means i for the operating surfaces of the draw cylinder and piston of a roll-over machine; to provide improved supporting mechanism for the draw cylinder of a roll-over mechanism; and such further objects, advantages and capabilities as will hereafter appear and as are inherent in the construction disclosed herein. My invention further resides in the combination, construction and arrangement of parts illustrated in the accompanying drawing and, while I have shown therein what is now considered the preferred embodiment of this invention, I desire the same to be understood as illustrative only and not to be interpreted in a limiting sense.

In the drawing annexed hereto and forming a part hereof,

F i 1 is an elevation of a structure embodying my present improvements;

Fig. 2 is a vertical, substantially central section through the structure shown in Fig. 1;

Fig. 3 is a transverse section substantially along the plane indicated by the line AA, Fig. 2. a

2 Referring more in detail to the annexed drawing, the flask rest of a machine embodying my present invention is denoted by the numeral 2, the supporting base by the numeral 3, the draw cylinder by the numeral 4 and the draw piston by the numeral 5. The parts thus far referred to are common in the art and no invention is claimed therein. The draw piston is provided with piston rings 6 for preventing escape of air from the space 7 when compressed air is admitted to this space through the pipe 8, connected to the source of compressed air normally used in connection with such mechanism. A packing'9 is provided at the upper end of the cylinder 4 to assist in guiding the draw 1930. Serial No. 447,565.

piston and preventing escape of air from the space 7.

A flange 10 extends laterally from the upper end of the piston 5 and serves as means to which can be attached the skirt 11, which extends downwardly within the protecting cylinder 12 to a point such that its lower end willbe well below the upper end 13 of the protecting cylinder. This end 13 extends inwardly slightly so as to result in a clearance between the skirt 11 and the cylinder 12 so as to reduce the amount of friction between these parts as the piston 5' movesup and down in its course of travel.

A flange 14 extends laterally from the pro tecting cylinder 12 and rests upon the base 3 to which it is secured by a series of bolts 15. The cylinder 4 is provided adjacent its lower end with a flange 16 which extends outwardly to rest upon and be secured to the inturned flange 17 of the cylinder 12. These two flanges 16 and 17 are secured together by means of bolts 18 and this protecting cylinder therefore serves as means for properly positioning the cylinder 4 and holding the same in place. At the same time, it will be seen that because of the close fit between the cylinder 12 and the skirt 11 no sandwill be permitted to get in between these to cause scoring of the contacting surfaces. Also, which is the main purpose of thisv invention, this construction prevents sand from getting in between the cylinder 4 and piston 5 and thereby causing scoring of the contacting faces of these-two elements. As a result of this construction, the useful life of this machine, without repairs in connection with these parts, is considerably prolonged.

Stop rods 19, having nuts 20 upon the ends thereof extend through openings in the flange 10 and the nuts '20 engage the bottom faces of the bosses 21 upon the outside of cylinder 4 when-the flask rest is raised to its highest position. These therefore serve as stops to limit the upward motion of the flask rest when compressed air is turned into the space 7. It will be seen from this that the bottom end of the skirt 11 will stop considerably below the upper end 13 of the cylinder 12 when V the upper limit of movement of the flask rest is reached. 7

It is believed that the construction, use, and advantages of the present invention will be appreciated from the foregoing description without further explanation thereof.

It inf aourse understood that the specific description of structure set forth above may be departed from without departing from the spirit of my invention as set forth in this specification and the appended claims.

Having now described my invention, I

claim:

1. In a structure of the general Dfl-tllre described, having a supporting base, an elonhoilow bodyof approximately uniform diameter havin an external projection tozhe sewred to the andloe held in position theveby, a draw cylinder hawingan external outwardly projecting flange connected in fight'relmtion with said hollow bodyto be i -bhereby upon said base, a piston sli mg within said cylinder and having an e 'utwarcfiy projecting flange ad'jaoent its ex posed end,and askilt surrounding said-flange and secured "thereto in tight relation, said proecting within the hollow -body and sfiding'lo'ngjitudinallythereofl said skirt and hollow body having a. substantially tight fit at their meeting points whereby to prevent access of-sa'ndor other scoring material to the contadin "feces of the cylinder and piston. 25in esk rest actuating mechanism, .a

amw piston upon which the flask rest is mounted and by which it is moved vertically, a'dtaw-eylindersurnounding saiddraw piston andin which said iston slides in actuating the flask rest, a-

extending laterally I itemthe free end ofthedra'wpiston and overhanging the end of thedmwrcyli-nden-a i v skirt secured to said flange and depending therefrom, and a hollow body surrounding I said skirt andharvin a tight slidin fit with thvmtoalsai hollow body s-Sep i b g held in place theneby rand fi lmtimcture as defined- :by claim 2 having memsfor stopping the outwardxmovement'of the skirt, with relation to {the hollow body before these ,perts reach the paint of separation-thereof.

. to the frame of the mao'hme for the V giseeured to the draw cylinder 'f-orjgthe purpose .of holding same properly positioned withrelmtiontothe rameof th'emachine.

ln'wvitness whereof, hereunto subscribe my name-to :this specification. I

. CHAS. F. V 

